king about.
-=Bryan=-
From: Chris Howard
Sent: January 6, 2022 6:56 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Re: Where do people get the time?
When I was a kid in the 1960's we got the time by calling a phone
number.
"Bankers Trust time ten fi
___
> From: Chris Howard
> Sent: January 6, 2022 6:56 PM
> To: time-nuts@lists.febo.com
> Subject: [time-nuts] Re: Where do people get the time?
>
>
> When I was a kid in the 1960's we got the time by calling a
, and only after asking those on the "party line" to hang up, only those
over 55 would know what I am talking about.
-=Bryan=-
From: Chris Howard
Sent: January 6, 2022 6:56 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Re: Where do people ge
When I was a kid in the 1960's we got the time by calling a phone number.
"Bankers Trust time ten fifty three; temperature 46"
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time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an
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Tom Van Baak wrote:
>
> The new years celebrations last night remind me of another source of time:
> time balls.
There's a splendid building in Leeds that used to be a clock-maker's shop.
https://en.wikipedia.org/wiki/Time_Ball_Buildings,_Leeds
(tho last time I was there it was looking rather
And in flight simulation, movement of the simulator’s hydraulic or
electric-driven motion platform adds another aspect to the timing problem. When
a pilot moves the control wheel or rudder pedals he expects to see a change in
his instruments, a change in the view out the cockpit windows,
Hal Murray writes:
> Are people sensitive to the sound being early?
There has been quite a lot of research on that, but I have not followed
it for many years.
The overall situation is that if the sound arrives before the visual event
the brain gets quite confused, but it can arrive and
On 1/2/2022 1:17 PM, Lux, Jim wrote:
I watched a Titan IV launch from about 10km away. You saw the ignition, a
5-10 seconds later you felt the ground shaking, and the rocket was maybe
300-400 meters up and hitting the scattered clouds before the sound got to you
30 seconds later, and then you
Hi. (former) Movie projectionist here. Some comments on multiple messages
inline below:
Hal Murray wrote on Sun, 2 Jan 2022
at 12:57:24 EST in
<20220102175724.6d8ab28c...@107-137-68-211.lightspeed.sntcca.sbcglobal.net>:
> How far off does the audio have to be before it doesn't look/sound
>
On 1/2/22 12:39 PM, Peter Vince wrote:
I used to work in broadcast television, and find that most people would
notice a couple of "frames" (80ms here in the UK) - we, trained and looking
for it, would notice one frame (40ms). But it is more disturbing if the
sound is early, as that is so
On Sun, 2 Jan 2022 at 17:57, Hal Murray wrote:
>
>
> How far off does the audio have to be before it doesn't look/sound
right? How
> accurately does the typical movie process get things aligned?
I used to work in broadcast television, and find that most people would
notice a couple of "frames"
On 1/2/22 9:57 AM, Hal Murray wrote:
j...@luxfamily.com said:
So the *sound* of the clap has to propagate to the sound recording equipment
(some ten miliseconds away if the mic is on a fishpole or boom).
How far off does the audio have to be before it doesn't look/sound right? How
accurately
>
>
>
> How far off does the audio have to be before it doesn't look/sound right?
> How
> accurately does the typical movie process get things aligned?
>
> Are people sensitive to the sound being early?
>
Pretty sensitive, I think. We forgive a lot of poor lipsync on youtube or
live TV but we
j...@luxfamily.com said:
> So the *sound* of the clap has to propagate to the sound recording equipment
> (some ten miliseconds away if the mic is on a fishpole or boom).
How far off does the audio have to be before it doesn't look/sound right? How
accurately does the typical movie process
On 1/1/22 8:48 PM, Tom Van Baak wrote:
Hal Murray wrote:
> where do you get the time?
The new years celebrations last night remind me of another source of
time: time balls.
Although a bit of nostalgia these days or even a joke, time balls were
clever, precise, and a critical part of naval
Thanks for that, an enjoyable lecture !
Does anyone know more about the question at 1:05:50 - a difference between
GMT and 'London time' used by airlines ? The questioner seemed sure it
wasn't daylight savings, but I live only half a degree east of the meridian
and am not aware of any other
Hal Murray wrote:
> where do you get the time?
The new years celebrations last night remind me of another source of
time: time balls.
Although a bit of nostalgia these days or even a joke, time balls were
clever, precise, and a critical part of naval infrastructure in the 19th
century,
It looks like the PDF that Demetrios Matsakis attached to his posting
did not make it through to the list. We are debugging that right now.
Meanwhile you can pick up a copy at any of these locations:
"Time and frequency from electrical power lines", Hardis, Fonville, Matsakis
This line in Thomas Erb’s email prompts me to point out that the power
companies twice tried to eliminate the requirement to keep the Time accurate to
UTC (2011 and more recently). According to the FERC’s summary in 2020 they
denied the most recent petition because two people wrote letters as
On Tue, Dec 28, 2021 at 2:29 AM Hal Murray wrote:
> jh...@alum.mit.edu said:
> > every few months websites stop working and I look and it's bceuase
> > the date has been reset back to 2011 or 2003 and so SSL certificate validity
>
> What does "sync time to the network" mean? What software is
jh...@alum.mit.edu said:
> Most notably for me is when I have my cellphone set to sync time to the
> network, every few months websites stop working and I look and it's bceuase
> the date has been reset back to 2011 or 2003 and so SSL certificate validity
> ranges are exceeded. And this with a
Hi Bill:
Here are a couple of web pages on the Western Union clocks made by the Self
Winding Clock Co:
https://prc68.com/I/SWCC.shtml
https://prc68.com/I/SWCC2.shtml
I think it was more like 200 Volts and it's important because the time constant of an L - R circuit is L/R, so by adding
a
In the UK, the BT speaking clock, apparently, is still operational.But
at a cost of 50p per minute, I doubt it gets much use.
I'm not going to waste 50p by dialling 123 from the landline to test it
still goes, and it doesn't work on mobiles.
Andy
www.g4jnt.com
On Mon, 27 Dec 2021 at 20:28,
For what it's worth, my google pixel on AT's network in the US is almost
always at least a second off UTC - at the moment, it shows -1.77s (courtesy
of the ClockSync app). Seeing it within 0.5s is actually mysteriously rare.
On Mon, Dec 27, 2021, 2:16 PM Adam Space wrote:
> As a younger person
Adam Space wrote on Mon, 27 Dec 2021
at 14:10:45 EST in
:
> As a younger person I appreciate this write-up. It is interesting to see
> the progression. Nowadays, phones are synchronized to within a second
> easily, and probably within 10ms
Would this were true, but it's not and you cannot rely
Hi
Back a while ago, Symmetricom came out with a series of cell disciplined
oscillators.
Some had Rb’s in them, a few had OCXO’s. More or less, the idea was to have a
GPSDO equivalent device that could be deployed without the antenna hassles that
GPS can entail.
After a few years, they pretty
As a younger person I appreciate this write-up. It is interesting to see
the progression. Nowadays, phones are synchronized to within a second
easily, and probably within 10ms at least once per day (this is what I
suspect from occasionally checking the offset on my phone). With computers
too, I
I have had one of those Western Union clocks for 30 years and it is still
working. Originally powered by 2 # 6 dry cells that ran the clock for years.
Now powered by 2 D cells that run it for a year.
To reset the time WU would stop all traffic on their wire from 1159 to 1201 and
at 1200
ESE has personal computer (PC) software (Windows) for configuring various ESE
products, using serial communications (RS-232 or USB).
The ES-192U has a serial connector (DB-9R) on its Rear Panel.
i have used USB-RS232 Bridge cables with Win10 computers w/o RS-232 ports.
Hi
Working at Motorola at the time and seeing just how much trouble they
had turning into a “software based” company, there were indeed issues
on the supplier end. The got there eventually, but it took quite a while.
Bob
> On Dec 26, 2021, at 2:47 AM, Poul-Henning Kamp wrote:
>
>
>
Attila Kinali writes:
> Not only did the US switch to
> digital cellphone systems about half a decade after Europe,
Dont just blame the telco's, both FCC, DOJ (on behalf of FBI) and
in particular NSA, exhibited olympic-class foot-dragging to keep the
air analog.
--
Poul-Henning Kamp
On Sat, 25 Dec 2021 17:38:54 -0800
Steve Allen wrote:
> Did everyone involved in designing the hardware and software
> intend that phone to have precise time?
>
> https://www.jwz.org/blog/2010/07/what-at-t-doesnt-run-ntpd/
JWZ was/is US based. Cellphones developed in the US quite
differently
On Sun 2021-12-26T02:06:07+0100 Attila Kinali hath writ:
> Cellphone network time distribution is something rather new
> and didn't exist until EDGE (or was it HSDPA?) came along.
> But once it was available, it was "good enough", i.e. the
> time offset was low enough to be not perceivable
On Sat, 25 Dec 2021 15:27:51 -0800
Hal Murray wrote:
> How good are cell phones? I remember comments about them being way off. But
> that was a long time ago.
Cellphone network time distribution is something rather new
and didn't exist until EDGE (or was it HSDPA?) came along.
But once it
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